Rotary pump



,May 29, 192s.

F. E. BRADY, JR

ROTARY PUMP 5 Sheets-Sheet l Filed April 6, 1925 3mm/HIM:

A"git-aimais I yMuy 29, 192s., 1,671,399

F. E. BRADY, JR

ROTARY PUMP Filed pril 6, 1925 l 5 sheets-sheet 2 F. E. BRADY, JR

May 29, 1928.

ROTARY PUMP Filed April 6, 1925 Patented May 29, 192s.

UNITED STATES PATENT OFFICE.

FRANCIS E. BRADY, JR., 0F MUNCIE, INDIANA, ASSIGNOR 0F ONE-THIRD TO ROYA.

OPPENHEIJI AND ONE-THIRD T0 DAVID MAN.

OPPENHEIM, BOTH or DETROIT, MICH- ROTABY PUMP.

Application led April 6, 1925. Serial No. 21,001.

This invention relates to rotary pumps of the.type whereln a drumrotates w1th1n a casing on an axis eccentric thereto and 1s providedwith one or more radiallyl movable wings which serve to divide thecrescent shaped space between the drum and the casing into suction andpressure compartments in a manner well known in the art to which thisinvention appertains.

Such devices are quite effective under suitable conditions of operation,but have the drawback that the friction between the outer ends of thewings and the peripheral wall of their efficiency. This is especiallythecase when the pumps are operated at high speeds, due to the fact thatthe centrifugal force acting on the Said wings results in a pressurethereof against the peripheral walls of the casing which pressureincreases by the square of the speed. It will therefore be.

apparent that very definite limitations are placed upon the speed atwhich such a pump -niay be operated, and particularly at which it may beoperated with any degree of eiiiciency.

- The arrangement however is a simple one and lends itself to use insmall pumps where size and simplicity of" construction are importantfactors to be considered, and this type would no doubt be much moreuniversally adopted for small pumps were it not for the `fact that tosecure 4appreciable capacity and head it is necessary to operate them atmore or less high speeds and the disadvantages pointed out are then metwith.

By my present invention I proposeto overcome the aforesaid"objectionable features to an extent which will render pumps of this typecapable of operationat high speeds and therefore applicable for use ashigh speed rotary pumps, such as in effecting the circulation of coolingliquids in connection with automobiles and similar constructions wherecompactness, light weight, substantial capacity, and positive action aredesirable. J

The invention further aims to practically eliminate the setting u offriction in such pumps by the centri gal action of the wings, byinterposing between the outer edges of the wings and the peripheral wallof the casing stops or abutments rotatable the casing offsets to someextent with the wings within the casing and against whlch the said wingsradially bear when in operation.

The invention further contemplates the incorporation in a rotary pump ofthe said type of a member rotatable with the eccenf tric drum but on anaxis concentric with the casing, said member being provided withabutments extending transversely of the casing and in radial alignmentwith the said wings, whereby the said wings are prevented at all timesfrom coming into contact with the peripheral wall of the said casing'.

Still further objects are to eliminate the packing of the stuffing boxwill not become intermingled with oil in the bearing and reduce its mentfurther having the feature that it 1nlubricating qualities; thearranO'e-- cludes a combination bearing and stuiing v box gland vwiththe bearing isolated from the stuffing box and wherein provision is madeof adjustment of the stuiing box gland 'and the maintenance of correctalignment in the bearing.

Furthermore, the device may be readily and cheaply produced by screwmachine methods, thus eliminating thev costly procedure usually calledfor in outboard bearings, where the casing of the pump is required to beespecially set up for the machining .of such bearings. f

Still further objects subsidiary to or resulting from the aforesaidobjects, of* from the construction tion as it may be carried intoeffect, will become apparent as the said invention is hereinafterfurther disclosed.

In carrying the invention into effect I may provide a casino' and arotor eccentrically mounted therein and having one or more radiallymovable wings, these ele-v or operation of the invenmentsbeing similarto those well known in the art to which this inventionV appertains,except that the eccentric rotor is not necessarily positioned directlyagainst the peripheral wall of the casing as is usual and the radialwings thereof do not contact with the said peripheral wall, the pumpbeing provided with an additional member rotatable with the said rotorbut on a common axis with the casing and having walls or abutmentsagainst which the outer ends of the said wings are seated, so that, asthe pump is operated, the said abutments prevent contact between theouter ends of the wings andthe inner peripheral wall -of the casing butat the same time cooperate with the said wings in effectively providingseparation of the intake and discharge compartments of the pump.

Suitable means are provided for ensuring the proper synchronizing of therotation of the rotor and the auxiliary member referred to. A referredform of bearing for the sha-ft o the rotor and for the shaft of theauxiliary member, comprises a stuiing box cap) or ,gland substantiallyextended to house a earing proper atthe outer end thereof and providedywith an orifice intermediate of its length which isolates the 'stuliingbox portion from the bearing portion of the device so that, when in use,any leakage of fluid ast the stuiling box may readily escape t rough theopening instead of passing along the shaft to the bearing proper. Toensure proper alignment of the bearing and at the same time admit ofadjustment of the stuffing box true shims are interposed between thecasing and the inner end of the device sothat engagement of the saidinner end with said shims will ensure the member being held in truealignment, it being understood that the surface of the casing against ywhich the shims rest is truly machined with i the rotary disk;

that object in View.

All of which is more particularly described and ascertained hereinafter,by way of example, havingreference to the accomypanying drawings,wherein Figure l is an elevation of a rotary pump embodying m31invention, the cover plate being remove F1gure 2 is a transversevertical section ofthe same, the rotorl being shown partly brokenaway-in sections;

Figure 3 Iis a detail perspective view of one of the radial wings;

Figure 4 is a similar View to Figure 1 of a modifiedform of the pump;Figure 5 is a transverse section of the same;

Figure 6 is a detail perspectiye view of l' Figure 7 is a detailperspective view of one of. the radial wings of the modified fom; l,

Figure 8 is a similar view to Figures and -l of a further modifiedconstruction; and

Figure 9 is a fragmentary transverse section of. such further modifiedform of pump.

Similar characters of reference indicate similar parts in the severalgures of the drawings.

Referring casing of the pump which includes the cover plate 2, and 3 isa rotor the shaft 4 of which extends through the cover plate of thecasing. The said rotor is radially slotted at 5 and 6 and provided withradially movable wings 7 and 8, the axis of the said rotor irst ,toFigures 1 to 3, 1 is thel being eccentric to the axle of the casing as lis usual in these types of pumps.

Ordinarily the rotor is located so that it is contiguous to one point ofthe inner pe the resultant friction between the said wings and the saidperipheral wall may Yabsorb power to such an extentas torender theoperation of the device at high speeds absolutely impracticable.

By my invention I avoid these conditions in a very simple manner. Itwill be noted that an auxiliary rotor disk or plate 9 is housed in thecasing and is provided with a shaft 10 coaxial therewith and extendedtherefrom, this rotor disk being of the iii-- ternal diameter of thesaid casing and having an annular wall 11 concentric with the eripheralwall of the said casing whereby 1t forms a rotatable lining therewithin.

Incidentally the said annular wall forms an abutment for the outer endsof the wings 7 and 8, and the rotor 3 is eccentrically positionedagainst the inner surface of the said annular wall.

The said disk is provided with a recess 12 into which a pin orprojection 13 on one of the wings extends Iso that positive rotation ofthe rotor 3 may be effected bythe i rotation of the disk 9, orvice-versa, according to which ofthe shafts, 4 or 10, is usedas a'driving shaft. 'It 1s` preferred to operate the pump through the shaft10 of the auxiliary rotor.

14 and 15 are inlet and outlet passages of lthe pump, and to'admit oftheir communication with the interior thereof the annulary wall 11 ofthe auxiliary rotor'is rovided with perforations 16 through whi'c liquidmay pass 1n entering or leavmgthe pump.

It will be apparent that, as the wings I l peripheral wall of the casingis practically.

aconstant factor and may be reduced to a,

minimum by the proper mounting and pro-A portioning of the parts. In anycase, it is not influenced by centrifugal force in the manner whichobtains in theordinary type of rotary pump hereinbefore referred to'.

Of course, a perforated annular Wall as` shown in the said Figures 1 and2 imposes certain restrictions on the capacity of the pump due to thefactthat the fluid must pass through these perforations tol enter and vlleave the pump, so that to meet suchv conwhich they radiall abut, theymay be con-` c vcesses 33 and 34 in the said abutments.

ditions vI may utilize the form illustrated in Figures 4 and 5 wherein Iarrange the rotor 17 in peripheral abutment with the inner of uti zing acomplete annular wall. On the rotary disk.18 of this arrangement' Isimply use segments 19 and 20 of suchwall, which segments' formabutments against which the wings 21 and 22 of the rotor impinge.v Thesaid rotor is provided with peripheral recesses 23 'and 24 which receivethe segments 19 and 20 as they alternately pass the point at which therotor and the casing meet. In this arrangement it will be seen that nointerference is offered the pas' sage of iuid into and fromv the pump,su`ch as is offered by the perforated annular wall 11 of the previously'described construction.

Although a plurality of wings have been generally described inconnection with this pump, it will be understood that only one wing maybe utilized if so desired, as indicated in Figures 8 and 9 wherein therotor 25 has a single 'radial slot 26'therein in which the wing 27 islocated, 28 being the .auxiliary rotor against which the saidl wing 27bears, and in this case a substantial segment 29 of the annular wall 30.of the said auxiliary rotor is unperforated so that it willprevent aclear passage being established between the inlet and outlet passages ofthe pump when the said Wing is in an intermediate position between thesaid passages. v

Instead of the wings being independent of the annular wall, or themember against nected thereto as s own in the said Figures 4, 5, 6 and7, such as by having their outerends provided with rounded projections31 and 32 hingedly entering corresponding re- This arrangement permitsthe annular swinging ofthe wings with respect to the abutmentsperipheral Wall of the casing insteadv resulting from the eccentricrelation of the rotor proper to the auxiliary rotor disk ensuring apositive connection between the said Wings and the said disk; but itwillbe understood that any connection which may be established betweenthe wings vand. the said disk has its principal utility in `the startingof the pump, as, when the pump'is operating at high speeds, centrifugalactionmay be relied on to ensure the synchronized movement of both, thewings and the abutment carryingdisk `and incidentally of the rotorproper.

Much difficulty is often experienced in rotary pumps in preventing waterfrom intermingling with oil inthe bearings which greatly reduces thelubricating properties thereof, and to overcome this it has been thepractice to provide outboardbearings extending from the casing or fromthe pump mountings, an arrangement which greatly increases the` laborand expense entailed in the production of such pumps. that the bearingbe directly attached to the Itis very desirable stuffing boxl throughWhich the shaft of the e i pump extends, but diiiculty has beenexperienced in ensuring the proper alignment of bearings mounted inthismanner. I, therefore, propose to utilize an improved.- form of pumpbearing which includes a tubular housing 35bored and threaded at one end36 to form a stuffing box cap ada ted to be threaded onto a gland 37exten in from that vpart of the pump casing throug which the shaftextends. casing surrounding the said ange is provided witha squarelymachined surface or shoulder 38. The inner 'end of the member 35 is alsoprovided with a `similarly true shoulder 39 and the outer end of thesaid j member 35 is bored to receive a bearing 40.

The part of the When the stuffing box 'cap 36 is appflied y to the gland37 the shoulder 39 may engage the 4shoulder 38 of the casing and ensurelthe proper coaxial alignment of the bearing j 30 with the axis of theshaft, and to secure adjustment of the cap on the gland, shims 40a maybe inserted between the shoulders 38 and 39.

The `housing 35 is provided with angorilice 41 intermediate the stuffingbox portion 3,6 and the bearing 40, so that any leakage of fluid pastthe said stuffing box may escape from the housing throu h the ori-` ice41 instead -of-passing throug the bearing 40 -and contaminating the-lubricant thereof. v

In the said Figures 8 and 9.'the rotor is shown, as havin its drivingshaft 42 extending outward y of the casing on one side and journalled ina bearing'43 on the other side, and the auxiliary rotor `28 isprovidedwith a hollow shaft 44'journalled 1n a circular recess 45 in the endwall of the casing,

throughA which V'hollowshaft A"the shaft o'fthe, rotor 25 eccentricallyextends. PumpsA constructed 1n 1 accordance with' this invention .duetothe fact that the may be operated at highs weeds' are capa leof.substantial vfluid disp acement relative .to

v their size and lend themselves excellently to i-...use in the coolingsystem of automobiles or for other 'purposes where comparatively smallpumps' are required and due ,to the substantial reduction of thefriction, usually .latten'din their lie d of usefulness `isconsiderably. in' creased so that they-may be ado ted inr a pumps of'the typev referred to,

great many instances where t ey have ip therto not been consideredfeasible dueto disadvantages a hereinbefore Ypointed out.

'Hereu, andv in the claims,l theJ term synchronized rotation, as appliedby. the

rotor and 'therotary' plate, is` not intended l `tov indicate thatsuchrotation necessarily agrees in speed throughout 'each revolution,4v

. A hel but that an equal .number of revolutions are erformed, as, whereoneof the webs is in edlyj secured to its abutment. and is in strictradial alignment inthe rotor at'all times, a respective oscillationbetween the late and the rotor varying the relative Spee of rotation atdiil'erent points `in the r cycle will result, as will be readilyunderstood.

l This invention ma y. bel developedA within the scope of the fo owingclaims without departing from the essential features of the j Asaid'invention, -and it is desired that the specification and drawing be readas merely illustrative and not in. a limiting sense, ex-

cept as necessitated by the prior art.

' between the outer" end of said wing and the i to surrounding wall ofsaid casing. 0

2. rotary.pump according to` claim 1,

,passing between the adjacent o rotor and the surrounding wa .offsaidVcas- ,3. 1A frotary pump according to claiml, wherein the he into thepat o sai 4abutment and a ethe accommodationl of. said abutment whening.

4. casing, a 'rotatab e in, positive means or,.rotating.s ai lining,

a rotor mounted ecccntrically to the. axisV of the rotor" extendsy In arotary uniphavi l-a cylindrical' eriphera linin .theref wherein the Quer'end trae iaiawingaff hingedly engaged with said, abutment.'I

`riph'eral recess is provided insaid rotor orv ints of said, l

thereof 'and rotatable with said lining, va. 5;;

hollow s haft on .said lmmg, a ourna in sa1d.'casmg, and' a drivin kshaon said.

rotor Aextending eccentricaly through said f hollow shaft fromsaidcasing. l

5. In a rotary pum having agc lindrical `radially slidable wing insaidrotor, the" outer end of which engages saidvlinin a' casing, arotary 'mem er in the orln of a plate at one end of said casing androtatable about the axis thereof, a second roy tary member in the formofarotor eccentric thereto between said plate vand an op-4 i posed wall ofsaid casing, said 'rotary mem.

ers being adapted to lsynchronized, rotation, a radiallyslidablev wingin said rotor, means on said plate interposed between the outer end ofsaid wing `and` the surroundf ing wall of said casing, and means bywhich one of said rotary members may be driven:

6. The lcombination with a casing-'havin an inlet and loutlet ort, `anda rotor forme with recessed ra ial slots eccentrically mounted withinthe casing,l of a plate con-.

centrically mounted within thecasing and provided witha circularextension formed with a transverse circular groove, -wing's havingrounded heads engageable kwithin the groove of the said extension andadapted to operate within the said radial operatively connecting thesaid rotor with thc said plate whereby either one .may be adapted todrive the other.'

7 In testimony whereof I aix my signature.

FRANCIS E. BRADYwIn.

95 slots formed vin ythe rotor, and means fork

